数据结构期末复习（ろく）--双向链表

Posted 2020-11-18 dsyr

 1 #include <iostream>
 2 using namespace std;
 3 typedef struct DulNode
 4 {
 5     int data;
 6     struct DulNode *next;  //后继节点
 7     struct DulNode *prior; //前驱节点
 8 }DulNode,*DulLinkList;
 9 
10 
11 void Creat_DLink(DulLinkList &L)  //尾插法创建单链表
12 {
13     L = new DulNode;
14     L->next=NULL;         //先建立一个带头结点的空链表
15     DulLinkList p=L;   //中间变量
16     int n;
17     cout<<"1)你想输入多少数字？：";
18     cin>>n;
19     cout<<"请输入表数据,以空格隔开：";
20     for(int i = 0;i<n;++i)
21     {
22         DulLinkList s = new DulNode; //中间变量
23         cin>>s->data;  //将输入元素的值赋给s
24         s->next=NULL;  //将新节点插入到头节点之后
25         p->next=s;
26         s->prior=p;
27         p=s;
28     }
29     cout<<"建表成功
2)链表为：";
30 }
31 
32 DulNode *GetElem(DulLinkList L,int i)  //取得第i个位置的位置指针p
33 {
34     DulLinkList p = new DulNode;
35     p=L->next;
36     int j=1;
37     while(p&&j<i) {
38          p = p->next;
39          ++j;
40      }
41      return p;
42 }
43 
44 int Insert_DulLink(DulLinkList &L,int i,int e)  //插入
45 {
46     DulLinkList p=new DulNode;
47     DulLinkList s=new DulNode;
48     p=GetElem(L,i);
49     if(!p)
50         return -1;
51     s->data = e;
52     s->next = p->next; p->next = s;
53     s->next->prior = s; s->prior = p;
54     return 0;
55 
56 }
57 
58 int Delete_DulLink(DulLinkList &L,int i) //删除
59 {
60     DulLinkList p=new DulNode;
61     p=GetElem(L,i);
62     if(!p)
63         return -1;
64     p->prior->next=p->next;
65     p->next->prior=p->prior;
66     delete p;
67     cout<<"删除成功
";
68     return 0;
69 }
70 
71 void Print_DLink(DulLinkList L)  //输出
72 {
73     DulLinkList p=L->next;
74     while(p) {
75         cout<<p->data<<" ";
76         p=p->next;
77     }
78     cout<<endl;
79 }
80 
81 int main()
82 {
83     DulLinkList L;
84     int a,b;
85     Creat_DLink(L);
86     Print_DLink(L);
87     cout<<"3)请输入要插入的位置和数值：";
88     cin>>a>>b;
89     Insert_DulLink(L,a,b);
90     cout<<"插入后链表为：";
91     Print_DLink(L);
92     int i;
93     cout<<"4)请输入要删除的位置：";
94     cin>>i;
95     Delete_DulLink(L,i);
96     cout<<"删除后链表为：";
97     Print_DLink(L);
98     return 0;
99 }

编译结果如下：